/*
 * Blog: post grid and card (C08), pagination (C09), single post header and prose (C10), empty state (C11), 404 (C12),
 * search form (C13). Loaded only on the posts page, single posts, archives, search and the 404 page (inc/assets.php),
 * never on the front page and never in the shared sheets (CSS budget, spec section 10).
 */

/* stylelint-disable no-descending-specificity -- rules are grouped by component, not by specificity */

/* Listing and post header (light variant, under the dark breadcrumb) */
.nbt-listing-head {
	padding-block: var(--section-y-sm);
	border-bottom: var(--border);
	background: var(--c-surface);
}

.nbt-listing-title {
	max-width: 24ch;
	overflow-wrap: anywhere;
	margin-bottom: 0;
	font-size: var(--text-3xl);
}

.nbt-listing-lead {
	max-width: var(--prose-measure);
	margin-block: var(--space-3) 0;
	color: var(--c-ink-2);
}

.nbt-listing-head .nbt-search {
	margin-block-start: var(--space-6);
}

.nbt-post-head .nbt-listing-title {
	max-width: 30ch;
	margin-block-start: var(--space-3);
	font-size: var(--text-4xl);
}

.nbt-post-cats {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.nbt-blog {
	padding-block: var(--space-10) var(--section-y);
}

.nbt-hint {
	color: var(--c-ink-2);
}

/* Toolbar: category filter and search */
.nbt-blog-tools {
	display: grid;
	grid-template-columns: minmax(0, 1fr);
	gap: var(--space-6);
	margin-block-end: var(--space-10);
}

.nbt-filter ul {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.nbt-filter a,
a.nbt-post-cat {
	display: inline-flex;
	min-height: 44px;
	align-items: center;
	padding-inline: 14px;
	border: var(--border-strong);
	border-radius: var(--radius-xs);
	background: var(--c-paper);
	color: var(--c-ink);
	font: 500 13px/1 var(--font-mono);
	letter-spacing: 0.02em;
	text-decoration: none;
}

.nbt-filter a:hover,
a.nbt-post-cat:hover {
	border-color: var(--c-brand);
	background: var(--c-brand-tint);
	color: var(--c-brand);
}

.nbt-filter a[aria-current] {
	border-color: var(--c-brand);
	background: var(--c-brand);
	color: #fff;
}

/* Post grid and card */
.nbt-post-grid {
	display: grid;
	grid-template-columns: minmax(0, 1fr);
	gap: var(--grid-gap);
	margin: 0;
	padding: 0;
	list-style: none;
}

.nbt-post-card {
	position: relative;
	display: grid;
	height: 100%;
	grid-template-rows: auto 1fr;
	overflow: hidden;
	border: var(--border);
	border-radius: var(--radius-sm);
	background: var(--c-paper);
	transition: border-color var(--dur-1) var(--ease-standard), box-shadow var(--dur-2) var(--ease-out);
}

.nbt-post-media {
	position: relative;
	aspect-ratio: 16 / 9;
	overflow: hidden;
	background: var(--c-night-900);
}

.nbt-post-thumb {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform var(--dur-3) var(--ease-out);
}

/* No featured image: a night tile with the grid, one fibre path and a crosshair (design system 7.4). */
.nbt-post-fallback {
	position: absolute;
	inset: 0;
	background-color: var(--c-night-900);
	background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px), linear-gradient(160deg, transparent 47%, var(--c-cyan) 47%, var(--c-cyan) 49%, transparent 49%);
	background-size: 24px 24px, 24px 24px, 100% 100%;
}

.nbt-post-fallback::after {
	content: "";
	position: absolute;
	top: 12px;
	right: 12px;
	width: 20px;
	height: 20px;
	background: linear-gradient(var(--c-cyan), var(--c-cyan)) center / 1px 100% no-repeat, linear-gradient(var(--c-cyan), var(--c-cyan)) center / 100% 1px no-repeat;
}

.nbt-post-text {
	display: grid;
	align-content: start;
	gap: var(--space-3);
	padding: var(--space-6);
}

.nbt-post-text > * {
	margin: 0;
}

.nbt-post-meta {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-2) var(--space-4);
	margin: 0;
	color: var(--c-ink-3);
	font: 400 var(--text-xs)/1.4 var(--font-mono);
}

.nbt-post-cat {
	color: var(--c-brand);
	font-weight: 500;
	letter-spacing: 0.04em;
	text-transform: uppercase;
}

.nbt-post-cat + .nbt-post-cat::before {
	content: "/ ";
	color: var(--c-ink-3);
}

a.nbt-post-cat {
	text-transform: none;
}

.nbt-post-title {
	overflow-wrap: anywhere;
	font-size: var(--text-xl);
	font-weight: 600;
	line-height: 1.25;
}

.nbt-post-title a {
	color: var(--c-ink);
	text-decoration: none;
}

/* The whole card is the link: one tab stop per card, one focus ring. */
.nbt-post-title a::after {
	content: "";
	position: absolute;
	inset: 0;
}

.nbt-post-title a:focus-visible {
	outline: none;
}

.nbt-post-title a:focus-visible::after {
	outline: 3px solid var(--c-focus);
	outline-offset: -3px;
}

.nbt-post-excerpt {
	display: -webkit-box;
	overflow: hidden;
	color: var(--c-ink-2);
	font-size: 0.9375rem;
	line-height: 1.55;
	-webkit-box-orient: vertical;
	-webkit-line-clamp: 3;
	line-clamp: 3;
}

.nbt-post-more {
	display: inline-flex;
	align-items: center;
	gap: var(--space-2);
	color: var(--c-brand);
	font-weight: 600;
}

.nbt-post-more::after {
	content: "";
	width: 1.25rem;
	height: 1.25rem;
	background-color: currentcolor;
	mask: url(../icons/arrow-right.svg) center / contain no-repeat;
	transition: transform var(--dur-2) var(--ease-out);
}

@media (hover: hover) {

	.nbt-post-card:hover {
		border-color: var(--c-brand);
		box-shadow: var(--shadow-2);
	}

	.nbt-post-card:hover .nbt-post-thumb {
		transform: scale(1.03);
	}

	.nbt-post-card:hover .nbt-post-title a {
		color: var(--c-brand);
	}

	.nbt-post-card:hover .nbt-post-more::after {
		transform: translateX(4px);
	}
}

@media (min-width: 48rem) {

	.nbt-post-grid {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

@media (min-width: 64rem) {

	.nbt-post-grid {
		grid-template-columns: repeat(3, minmax(0, 1fr));
	}

	.nbt-blog-tools {
		grid-template-columns: minmax(0, 1fr) minmax(16rem, 24rem);
		align-items: end;
	}
}

/* Pagination */
.nbt-pagination ul {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: var(--space-2);
	margin: var(--space-10) 0 0;
	padding: 0;
	list-style: none;
}

.nbt-pagination .page-numbers {
	display: inline-flex;
	min-width: 44px;
	min-height: 44px;
	align-items: center;
	justify-content: center;
	padding-inline: var(--space-3);
	border: var(--border-strong);
	border-radius: var(--radius-xs);
	background: var(--c-paper);
	color: var(--c-ink);
	font: 600 0.9375rem/1 var(--font-mono);
	text-decoration: none;
}

.nbt-pagination a.page-numbers:hover {
	border-color: var(--c-brand);
	background: var(--c-brand-tint);
	color: var(--c-brand);
}

.nbt-pagination .current {
	border-color: var(--c-brand);
	background: var(--c-brand);
	color: #fff;
}

.nbt-pagination .dots {
	border-color: transparent;
}

/* Empty state (C11) */
.nbt-empty {
	padding: var(--space-12) var(--space-6);
	border-radius: var(--radius-sm);
	background-color: var(--c-night-900);
	background-image: linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
	background-size: 48px 48px;
	color: var(--c-on-night-2);
	text-align: center;
}

.nbt-empty > * {
	margin-inline: auto;
}

.nbt-empty-title {
	max-width: 24ch;
	margin-bottom: var(--space-3);
	color: #fff;
	font-size: var(--text-2xl);
}

.nbt-empty p {
	max-width: 40rem;
}

.nbt-empty a {
	color: var(--c-cyan);
}

.nbt-empty :focus-visible {
	outline-color: var(--c-focus-night);
}

/* Search form (C13) */
.nbt-search {
	width: 100%;
	max-width: 32rem;
}

.nbt-search-label {
	display: block;
	margin-bottom: 6px;
	font-weight: 600;
	font-size: 0.9375rem;
}

.nbt-search-row {
	display: flex;
	gap: var(--space-2);
}

.nbt-search-field {
	flex: 1 1 auto;
	min-width: 0;
	min-height: 48px;
	padding: 12px 14px;
	border: var(--border-strong);
	border-radius: var(--radius-sm);
	background: var(--c-paper);
	color: var(--c-ink);
	font: 400 1rem/1.4 var(--font-sans);
}

.nbt-search-field:hover {
	border-color: var(--c-ink-3);
}

.nbt-search-field:focus {
	border-color: var(--c-brand);
}

/* Single post */
.nbt-post-body {
	padding-block: var(--space-10) var(--section-y);
}

.nbt-post-figure {
	max-width: var(--container-narrow);
	margin: 0 auto var(--space-8);
}

.nbt-post-image {
	display: block;
	width: 100%;
	height: auto;
	border-radius: var(--radius-sm);
}

.nbt-post-figure figcaption {
	margin-top: var(--space-2);
	color: var(--c-ink-3);
	font: 400 var(--text-sm)/1.4 var(--font-mono);
}

.nbt-post-prose {
	max-width: var(--container-narrow);
	margin-inline: auto;
	line-height: 1.7;
	overflow-wrap: anywhere;
}

.nbt-post-prose > * + * {
	margin-block-start: 1.25em;
}

.nbt-post-prose h2 {
	margin-block: 2.5em 0.6em;
	font-size: var(--text-2xl);
}

.nbt-post-prose h2::before {
	content: "";
	display: block;
	width: 32px;
	height: 3px;
	margin-bottom: var(--space-3);
	background: var(--c-cyan);
}

.nbt-post-prose h3 {
	margin-block: 2em 0.5em;
	font-size: var(--text-xl);
}

.nbt-post-prose h4 {
	font-size: var(--text-lg);
}

.nbt-post-prose ul,
.nbt-post-prose ol {
	padding-inline-start: 1.5em;
}

.nbt-post-prose li + li {
	margin-top: 0.5em;
}

.nbt-post-prose li > ul,
.nbt-post-prose li > ol {
	margin-bottom: 0;
}

.nbt-post-prose blockquote {
	margin-inline: 0;
	padding-inline-start: var(--space-6);
	border-inline-start: 3px solid var(--c-brand);
	color: var(--c-ink-2);
	font-size: var(--text-lg);
	font-style: italic;
	font-weight: 500;
}

.nbt-post-prose code {
	padding: 2px 6px;
	border-radius: var(--radius-xs);
	background: var(--c-surface-2);
}

.nbt-post-prose pre {
	padding: var(--space-5);
	overflow-x: auto;
	border-inline-start: 3px solid var(--c-cyan);
	border-radius: var(--radius-sm);
	background: var(--c-night-950);
	color: #e6eef7;
}

.nbt-post-prose pre code {
	padding: 0;
	background: none;
}

.nbt-post-prose figure {
	margin-inline: 0;
}

.nbt-post-prose img {
	border-radius: var(--radius-sm);
}

.nbt-post-prose figcaption {
	margin-top: var(--space-2);
	color: var(--c-ink-3);
	font: 400 var(--text-sm)/1.4 var(--font-mono);
}

.nbt-post-prose table {
	width: 100%;
	border-collapse: collapse;
}

.nbt-post-prose th,
.nbt-post-prose td {
	padding: var(--space-2) var(--space-3);
	border: var(--border);
	text-align: start;
}

.nbt-post-back {
	max-width: var(--container-narrow);
	margin: var(--space-10) auto 0;
}

/* 404 (C12) */
.nbt-404-lead {
	max-width: var(--prose-measure);
	color: var(--c-ink-2);
	font-size: var(--text-lg);
}

.nbt-404-links {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-3);
	margin: var(--space-6) 0 var(--space-10);
	padding: 0;
	list-style: none;
}